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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964796a5902748057164cc33c30b84a8903af0c20db91bb2c8ec60e0e2eed46d' 
  AND token = 'qONym6BtbQ4AkcBpI4/HNPzv4n1Enr7EYlU/6Jr/8gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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