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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cbf1789c60cd470f0b7bd526e1e5f999c9bb016d843581426fbbd55e607709d' 
  AND token = 'b0pBl4llRY9lMWzKM38Z02PdvdcuTWMhGYKWaUaRpJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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