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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e65eac765c517ab39a1808ea64b0dbe9bb159fcc3f2a547337f69426d9d159' 
  AND token = 'hla3RlEHs+HO8jP8w7lkdewLis5G3UNm1VxGcgYrXLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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