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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466ad07e775ca4094d7f8e7a114c9c65ec9fcbfa4f320c92026d7fc26abe0aeb' 
  AND token = 'jIxKE1O2oqouZlx5KWkgR1lm368K3O8ex/RjnNH3d2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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