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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b160ede96eeb14bd8bb25f6584a01d819e71814fbb6293eed5549ea8682efa' 
  AND token = 'tKW1oHwp8++cYyrA7BV2AFt8ktx6tc3m3xC/CiJ07AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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