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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55db09a7a394b9866b0ba73aefee0419d3ecefb877ac7286c2f2525f736bfb0e' 
  AND token = 'oQxQzaD7MN8oq4vfKBSn9vtbxhS/m0TR0cz+jLF9P1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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