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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c42079c1e0abe1e263eb9d627d78e93c7e08d0277fd0248755621fdfa0b56b5b' 
  AND token = '/oV0rZeWSUw3e1b86PKKhH4ODPxPLfBMwaYGxkueZLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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