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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90d816efce2858024f4265d0c1b95cac98959c05caa3ae191c4ef0c685c84e3' 
  AND token = '+L5SVqKCrkHEn4DSQELWTsmQDWC+v00oqev3h1neG6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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