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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b86d12fc5db486f0d79eeea22d55e6c1f28b73e995a8c68487545aca06f551' 
  AND token = 'aWSc0BEhm7MPjZp9Cdf02p85OqTDalCS+ihFcknS2N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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