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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02bd3ebcab94db280c303c2e6ddac908e4bc2e52ad0914ab7f689a5485a2203' 
  AND token = 'UdACLqg8VjMSkcs0vQ/TNCus3Qk60e2YdJGs4319WXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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