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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba98152070363f756b03885bc4715cf562b9368b251ac41e5adad1ce0e1c3d30' 
  AND token = 'ZjFaNExsfBAt0asfZ0NptJBlHmHQYhs5UH99fUHHpPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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