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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e77c05c45ff9826b2a4504befbd6f2180a388ab997d92631f75483f15da9bb' 
  AND token = 'teq9vEE1d8mkBZpv6yfAyuEandiTqrqUhffF3DeUhPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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