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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd3daba67e9e59a7782c657c05f63ff5327296cb75763a6be7ab4a60fdabc22' 
  AND token = 'Oww/Obsx/p+6K9qPRgFkaWQYu0JSPa+hTa2XXHqKaKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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