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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ec6bd4c253f4ef1814c64c83cbe3a3230d1c5847b84e27b17e2f30b9631688' 
  AND token = 'LVRHtBhzszHRUxH4Df9kQWa6/RzmkPc3WSY3k1LBLT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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