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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3afbbdf3ffedeb9678d15cbc75cffd7cc875a0a78480e3fcb1636a5a5b0c3dba' 
  AND token = 'gVYJ0T5Er3YLyXt5d6NbxjJ6OQKBBKRbhtyTCVtl7fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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