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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363887ccc155fec227074aa068dd235a890b303b6891912211547710f7ee8611' 
  AND token = '/exXAsU6WVOc/dPmRAJ+KRntl3ES//7qzo9PpT7oEBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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