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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3642b33b8b1990a3d6bec7b0a0abe54e64be86f3ec2adb367b74d1ddcaeef4c6' 
  AND token = 'stROB8Crz12MGFitu5G9YIJ0JDJ3/lp8EAvzTAPEn0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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