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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1dc97d77b83910fb49dcd577e8aa6b18cb5d085b414a88f8fda6917a8a622f3' 
  AND token = '2+qnWXO19Fs4Onnvcn1/QVT+ejzLTL7wzcXmXZ15Yl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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