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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dcccd10b5c5fc15a6e08961cc564054ef6f515bb30c1a5836b54a770f66c89a' 
  AND token = 'HhR6TBMcoPocPnJv1dfEhjfOvsvv+q5HDmIvKia00t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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