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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40089cc54b65e77fe1928bbc9b204bbcbf8523d418429cf4ea302a944bf65771' 
  AND token = '0sXzCJ8QoXX7L5zkWLwochtlMQ7PU7svsufA6YAGws0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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