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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a3bae28b1bfa198ba0d8a736062fa3394c0220afdc47cdbebb91c44f5baec3' 
  AND token = 'BklfeDhrDNN1KAVePkaN3r3iqnl4hx1QYGrHMHFT/Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}