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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd151cf6ff8131b964f3416c7647d2ccc73cffcbbb00448399760d580b9431a2' 
  AND token = 'rvuBdnRUu1i05SzqeNvP5ZjPH62RI9kLyUoZOuPpDqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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