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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa13ba1395ac3e1791d9e81b2b83c2b43fb4e47c4fa0bfb3bfe50ee07d976fdb' 
  AND token = 'kpB9t5a5Z3K7U/bKRES6+wlc3Fg8qUtDxZt+xQIQhLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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