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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe47ca7798d094d60f2342b65e9cf0858ee35d741768e616a8e51782653b857c' 
  AND token = '55CY5ZodEII4paNfg13L4JInrbJDGXNVNDqyC5edisM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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