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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40507593e276db10055cb58b3792b9902d77a48ee2cb955d2204feccde776d82' 
  AND token = 's28msi4GVNhjpX8cqnoe5XOdmcBymWHzQEQFrsmxUV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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