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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471539a0d3ca9e2f997a9cf64b424929a7cf757cd2c46d4697aeb867605d632f' 
  AND token = 'f7Rhb/+fUZGq5fDLX1bTUXtd8BARgw8OiUD8W7remNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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