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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239981a97e9257da25c6d49dff27d401e71886c7cbb49ecab4d44f22fca2e36d' 
  AND token = 'Q37y9O5jsIpkcTOis29VNqgrnrzeTUBEKDnkuuCEIAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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