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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7eb45cbb056d7b119ce39d289fa53db4b99d7ebc61d6bc19f8fa42d7128e0d6' 
  AND token = 'UuC7kFS88nFIHrAcsS6Zo9DzZyYWJSmN8pIIVE5l1r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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