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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71688a7fb3b1019a8a020802dd4f9fbb4d631ba842c0b4e40a7ab8fe26da70eb' 
  AND token = '3CxaCGa0vpi9ppQf+jUXHgRjondVb871KFAb1FAuJW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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