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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66da53538ab8e671efc02567d8867b3e58e88d0249eea7879ab4cbd4336a94db' 
  AND token = 'fN4mXGE7VxBQfA4QNLg+lVIdQ5v1DdEc1Gnjx4hcXv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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