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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d6f9bf3f0bacccd05d9b0857e4b05b87d0b4156a7b564084bb2e4f787be76f' 
  AND token = 'vB3OxEGE7Y7t0ktn+kTOSTZgCOUkBjkM3Q/VRN/4Nzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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