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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d51f24a8dcb3d447d2eb755d3af90c0ed825116967e49f094784578600f4ca' 
  AND token = 'OjAC5cuZPurInxmIw8y9YpmGkAdsxXGJU9/2dzNSNiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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