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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b334466bc1f65f222266e7f7864ca65f4fba0d12aa37333eddf766bea99886d' 
  AND token = 'Fwnv8r+Uuw2sLdCbV4erGs4CwC+4asVqPUXRSVF/kGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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