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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fdb5e84d436d2a11b6c83feadc427c362fc32a3f76969c895e03bd25474891b' 
  AND token = '/PlOTXcsf2bQRACBjrOcwaXnZi6nwTmTg17kGB/yb/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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