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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc9cab2028dbd70b2707df69498f283f894447759ea9634d92b0cd4cd63149d' 
  AND token = 'lL9i6i+WIbF370HneJnmMpeIBX61sFqdIjPaSZEliwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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