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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a6d033a90c64ca2c8ae8709a8c6c42949abed814d51a2f9fab761ffd02baa6' 
  AND token = 'Stn4yPPTpsusF7CSlAAaBIb98zzQi3nYB3ICy6i7Ito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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