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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1876092cf891904796752e1abdf8c681fad28e555c0ee25364aeb38ac140227' 
  AND token = 'CRJ/lnz0uIyZgaRZIeT2IRJITUVSrM1F1J0g5EmWWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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