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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a371ad7eee0f8f73c04621353d2a29f3f2b53175bb22c6aafe7f7a93e7a8e704' 
  AND token = 'ueqQ/n+JvRd2GDU1rNxHQO6RGSrRig6CWJxBxAykEeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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