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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '651bfa0b89c0c1fcad46cf4f20f55b278729ef0400e3d5e2d98ebf1b62e5c633' 
  AND token = 'FiBmdCiw9IfWhhT8RTjT291yQ8ct5mPs/mTK+Ljceh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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