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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc493bd522d92c79e3b16d5cc008d61636759d810e5a3bd7db6444d034af215' 
  AND token = 'pg+0Zl0n7THn1jg13sd0yT1Jbi0B00k2i2C8ht6rGgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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