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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c0646f068ae17a872af85f6f016f45dd028054c4e6c1fed858d5000b9af36d' 
  AND token = '48hx62PEjr9lO0kW7urdFPGFhHyTESiEPlT6ML1WTIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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