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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1c233889e20387d845ba1ce41971535d886119633f741ca065a3b8963b135d' 
  AND token = '4hPBAxBuYg54jI/Nq3Bin6zI0MUMrC3Ik3Ybg+WKlTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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