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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6290bfc8917b418537b675237ba8cadced3f9e62afe33820b4bf2da08a032bf3' 
  AND token = 'oEiC85kTDriCXU0yguRi/+ipZ8FWigG8R8Nv+jvII5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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