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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca3e3fc6f5f6b9a4dc979c0e1693a6a733f8b797ca3786c09340267b06e6efc' 
  AND token = 'LNh8YhxIdh6cEvfijT3Rhp0IhUvaS/LHXV/1BN5dkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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