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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dffe82c8368797732238e16c31dae432ac04c6d2b0959570f7a6d388234fb9' 
  AND token = 'AbjiLSQK3h97ZYctBb6X0MF2IGcvgkeUtm1DVYTfqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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