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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9099af8cdb3cb113dc5aab9d5639091e80a408babe9c458fd87a1a7cd732faed' 
  AND token = 'd6+1Bb5EasL3toAEIj4COouzlKDH2HO+05W9K0sfCE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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