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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0412ce883b4bedc4543d71997e458a062624ced1830c59b0c9ab1b3fc4c63f' 
  AND token = '+JPdL4xsziGSvueB5wJ2MqNaC5C1gyf6IAdMrWnPHAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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