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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7d1632edb5f3c97b14e5880ec332906d2f7624c0c686890242fa97678acfe91' 
  AND token = '6r9OVlSaw4Rz4zN9yWbfWJAxnpksaq7De6owbtGOzzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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