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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc76dcd416ba417794dc2c466fe8e9801daab591123b65f2e1cbe75894b6990' 
  AND token = 'uLvQs8uzi26tKDqk5nLZTSGQLpnCK8cZgvU3M8mvvlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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