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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af66a0e5f70b166f602895fe99a653ae0fca2c4e04efb69fb7b08288c1718b6' 
  AND token = 't/R7dYZyNcGrOjsyZNrbPBv7udA+U8Bh1McjneWWOEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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