SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195b031223f50b1400ca3f247de6682a422fbf8310c4f93132f4fd8414707056' 
  AND token = 'pmOPBOuGLEn3I9trCmfdcTlv0vnxbQjpYAL25tjOSmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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