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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d18466cc82be77799ed6eec817d533237743c7603743fabb08194aef4ba9f7c' 
  AND token = 'PPv1wmCJGZl+BWDk9dVmZNj2a7XXy2rxyJkrjpF7LA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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