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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545705147c2a1fd323bc2954bf45ea1e5cfec471d1c797d308245d5d7810e6b7' 
  AND token = '5rs87d2DgsSI+0OtoCAlNszyDl0oCA6qE/ldvMzLgjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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