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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65fd7ae2aaf8931b8eeb98bb2a0decd70641c97a045b38a6a10897937ae881df' 
  AND token = 'zGEOMOmx10ZoLol9uto2v7H6qtbM+5xNu4PKFkibBwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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