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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85467bace83450e1551871d2c69bac79cf9110ec304e4160942c2fbd700a6ee' 
  AND token = 'QBQfrYWu4utU5KAec7cjfKSA/fcg2mIJIN+YAbhvrLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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