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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4aad2a684b3a0909882e8979484441f30a341111668dc3dc0cae632296250b' 
  AND token = 'Xvy6+k/mOiT+FRjk2k6688B8jdrG2k1qbkW9zB2eqFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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