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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2aa725bb636eb557bf95089a9ee6bfe0e643fb85c1df106d4ac58de116edc8c' 
  AND token = 'muohq4Lx4WP/+N3alJ5xWEZptGpAJnqC4cWWwLGouog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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