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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48836277fbc78cef83f7a8f29b0ea94c8550e471ff318480d1ea366c3d537a7' 
  AND token = '6Su23FrGqBaDfyc42Bqp8TStZJGv60p1Ell+9Y+Ep1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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