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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8856b4d470ab3380f4f1f3c2d7d60c87eb251c336f8c6b1c64c81c95dad6d35b' 
  AND token = 'ujj2h1xTRyEKx0rBMWg8VFKLhQQLGIaKyxLBTyp/J64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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