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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4767a976c928c9f1e1c1691360b73107d5a1618001e34bdbe307a444342447f6' 
  AND token = 'Bw5n7WB24BI7LYDJ0L2zJZ93tvx8Xt5Dh6a9K64Owd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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