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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7c7fbf321c8e1aac5b3d79f36403897b1dba07650696ef9f9bf7dd922ef591' 
  AND token = 'CN8C+fMPJfpID3H0v2DtdRbMSOmgKAvyio8a3Hg75BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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