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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea4dd0ce6d67e9a988ed2221042eb881d83f1a76c18ea3c8fcda80b55ed32f4' 
  AND token = '4a47eJRWhBitzIplQGZ4O5s02N4RwsgC6vWLfltejIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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