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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c02498a573567ebfb6e15350de4904733766e1fabeb7e09b8d0c8423e0ba68' 
  AND token = 'vBVIzC3PI2XZco7BIR6g+dvTR/2cdCLQUExQ4czxSIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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